In this SearchSalesforce piece, Bluewolf pack member Jason Talis writes about creating a successful migration to the new Salesforce Lightning instance.

When the Salesforce Lightning development framework was rolled out in 2014, it kicked off a steady transformation in development of the Salesforce CRM platform that has been undergoing refinement since then. While the earlier Salesforce Classic development tool enabled a fair amount of customization, Lightning made custom development less code-intensive and easier for users. 

Salesforce has clearly indicated that its future roadmap hinges on Salesforce Lightning, not other development languages. But moving from Salesforce Classic to Salesforce Lightning development may involve a learning curve; despite the intuitive user interface, your company may need a change management strategy to get users ready for the new interface. So too, there are certain features and customizations that aren't Lightning-ready and that may require Classic, Visualforce or other development tools. 
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